求高手指点 ASP.NET ----ListBox控件问题？？
求高手指点 ASP.NET ----ListBox控件问题？？
在ListBox控件中怎么获取选种行?
ListBox1.SelectedItem.Text;获取不到值,为什么?


<asp:ListBox ID= "ListBox1 " runat= "server " Height= "344px "
OnSelectedIndexChanged= "ListBox1_SelectedIndexChanged "
Width= "409px "> </asp:ListBox>

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string dir = @ "G:\PHOTO ";
ListBox1.DataSource = ListFiles(new DirectoryInfo(dir));
ListBox1.DataBind();
}
public Array ListFiles(DirectoryInfo dir)
{
if (!dir.Exists)
return null;

if (dir == null)
return null;

FileSystemInfo[] files = dir.GetFileSystemInfos();
ArrayList al = new ArrayList();
for (int i = 0; i < files.Length; i++)
{
FileInfo file = files[i] as FileInfo;
if (file != null && file.Extension == ".jpg ")
{
al.Add(file.FullName.Substring(file.FullName.LastIndexOf(@ "\ ") + 1));
}
}
Array a = al.ToArray();
Array.Sort(a);
Array.Reverse(a);
return a;
}


protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
int index = ListBox1.SelectedIndex; ;

}
protected void Button1_Click(object sender, EventArgs e)
{
TextBox1.Text = ListBox1.SelectedItem.Text;
}
}


[解决办法]
ListBox1.DataSource = ListFiles(new DirectoryInfo(dir));
ListBox1.DataBind();

放在
if(!IsPostBack)
{
ListBox1.DataSource = ListFiles(new DirectoryInfo(dir));
ListBox1.DataBind();
}

[解决办法]
楼上正解
[解决办法]
hehe，给了代码总要自己修饰一下的...

一般数据绑定的时候在Page_Load里总是要用
if(!IsPostBack)
判断一下的

下次你第一个帖子说清楚，就不用再发第二个了...
[解决办法]
如果你要用ListBox1_SelectedIndexChanged时间，记得ListBox1的AutoPostBack属性要设置为true